开滦范各庄井田岩溶陷落柱发育特征及其主控因素研究
常永强
Development Characteristics and Main Control Factors of Karst Collapse Column in Kailuan Fangezhuang Mine Field, Kailuan
煤炭工程 . 2019, (7): 76 -79 .  DOI: 10.11799/ce201907017